i.e.、e.g.、etc.用法

本文首發於立文悉通微信公眾號（Transystom）

i.e.、e.g.、etc.用法

i.e.和e.g.的後面都要加逗號，如：

• adolescents, i.e., young people between the ages of 10 and 19 years
• adolescents (i.e., young people between the ages of 10 and 19 years)
• foods, e.g., milk, bread, and cheese
• foods (e.g., milk, bread, and cheese)

etc. 用在句尾時，不用再加句號了，如：

• The antibiotics included penicillin, erythromycin, azithromycin, etc.

etc.用在句中時，前後都要加逗號，如：

• Penicillin, erythromycin, azithromycin, etc., are used.

補充：

Grammar Girl did some research and determined that five out of six style guides lean toward using a comma after both i.e. and e.g. Heres the gist of the table she shared on her site:

• Chicago Manual of Style: A comma is usually used
• Blue Book of Grammar and Punctuation: Commas are preferable/optional
• The Columbia Guide to Standard American English: Editors require a comma
• The Guide to Grammar and Writing: The commas makes good sense
• Lynch Guide to Grammar: Should be followed by comma

Fowlers Modern English Usage: Commas do not usually follow i.e. (No comment on e.g.)

She also gives an excellent rundown on when to use each of these abbreviations. She suggests that you think of i.e. as meaning "in other words" and e.g. as meaning "for example." I recommend reading her whole article.